How deep is Long Lake?

Long Lake is more than 88 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 88 foot line, and the lake continues deeper inside it.

Where is the deepest part of Long Lake?

The deepest charted water on Long Lake lies inside the 88 ft contour, toward the northwestern corner of the lake. That contour encloses under an acre, under 1% of the mapped water, so it is a small target on a big lake, the depth chart above gives the contour to line up on.

How much of Long Lake is shallower than 30 feet?

About half. The 30 ft contour encloses 1,025 acres of the roughly 2,975 acres inside the outer 5 ft line, so the other half of the water is shallower than 30 feet. The sharpest drop is between 5 and 10 feet, where the mapped water sheds 785 acres.

How accurate is this Long Lake depth map?

The contours come from the Michigan DNR Inland Lake Contours survey, retrieved August 2026 and last rebuilt on August 19, 2026. Depths change over time with water levels and sediment, so treat this map as a planning guide for fishing, and never use it for navigation. Acreages are computed from the published contour geometry, not from a separate area survey, so read them as close approximations.

Michigan lake depth maps

Long Lake depth map

Long Lake in Grand Traverse County, Michigan reaches a depth of more than 88 feet at its deepest surveyed contour. Long Lake is charted here across 9 closed depth contours, from the 5 ft line down to 88 ft, enclosing about 2,975 acres of water. Half of that water lies inside the 30 ft line, and only under an acre lie inside the deepest one. Every contour is on the interactive map below, free and without an account.

Data: Michigan DNR Inland Lake Contours (public record). Contours closed, checked and area-computed by Jordan Carter, founder of GilledIt · page updated August 19, 2026

Long Lake depth chart: 9 depth contours from 5 to 88 ft

Data: Michigan DNR Inland Lake Contours (public record), retrieved August 2026 · depths change over time · not for navigation

Long Lake depth chart data: water enclosed by each contour
Depth contour	Water inside it	Share of mapped water
5 ft	2,975 acres	100%
10 ft	2,190 acres	74%
20 ft	1,660 acres	56%
30 ft	1,025 acres	35%
40 ft	608 acres	21%
50 ft	267 acres	9%
60 ft	36 acres	1.2%
70 ft	5.7 acres	under 1%
88 ft	under 1 acre	under 1%

Acreages are computed from the closed Michigan DNR Inland Lake Contours contour rings, with islands subtracted. Shares are of the 2,975 acres inside the outermost charted contour (the 5 ft line), which is the outer edge of the mapped water, several state files carry no 0 ft shoreline line, so this is not the same as a share of the lake's published surface area.

Fishing Long Lake: a stepped drop into deep water

The survey encloses about 2,975 acres of Long Lake inside its 5 ft contour, and half of that water lies inside the 30 ft line, so the bottom steps down contour by contour into the deep basin rather than shelving flat or plunging all at once. Between 5 and 10 ft the mapped water sheds 785 acres in 5 ft of depth, the sharpest change on the chart, start on that band, because it is where the bottom stops being flat. The 88 ft contour, toward the northwestern corner of the lake, encloses under an acre of water, a single pocket rather than a basin, but one worth a drift over in high summer. At 88 ft this is two-story water: the basin can stay cold below the summer thermocline while warm-water fish stay up on the 5-to-30 ft ground, and the fish that move between the two do it along the 5–10 ft break at first and last light.

Ice fishing on Long Lake

Deep water like Long Lake freezes later and less evenly than the shallow lakes around it, and the winter bite sets up on the first real break, not out over the 88 ft hole. That edge is the 5–10 ft band on the chart above, where 785 acres of bottom tilt away, and panfish and walleye work up and down it through the day. By late ice the fish push back onto the 5-to-30 ft flat. Check ice thickness locally before you walk out.

Long Lake depth map FAQs

How deep is Long Lake?: Long Lake is more than 88 feet deep. The deepest contour in the Michigan DNR Inland Lake Contours survey is the 88 foot line, and the lake continues deeper inside it.
Where is the deepest part of Long Lake?: The deepest charted water on Long Lake lies inside the 88 ft contour, toward the northwestern corner of the lake. That contour encloses under an acre, under 1% of the mapped water, so it is a small target on a big lake, the depth chart above gives the contour to line up on.
How much of Long Lake is shallower than 30 feet?: About half. The 30 ft contour encloses 1,025 acres of the roughly 2,975 acres inside the outer 5 ft line, so the other half of the water is shallower than 30 feet. The sharpest drop is between 5 and 10 feet, where the mapped water sheds 785 acres.
How accurate is this Long Lake depth map?: The contours come from the Michigan DNR Inland Lake Contours survey, retrieved August 2026 and last rebuilt on August 19, 2026. Depths change over time with water levels and sediment, so treat this map as a planning guide for fishing, and never use it for navigation. Acreages are computed from the published contour geometry, not from a separate area survey, so read them as close approximations.

Depth maps for lakes near Long Lake

Cedar Hedge Lake depth map · 69 ft max · 4 mi away
Silver Lake depth map · 96+ ft max · 4 mi away
Lake Ann depth map · 75 ft max · 5 mi away
Duck Lake depth map · 98 ft max · 6 mi away
Boardman Lake depth map · 73+ ft max · 7 mi away

Mapped fishing venues near Long Lake

Long Lake in the venue directory covers access and fishing details for this water.

Cedar Hedge Lake · 4 mi away
Silver Lake · 4 mi away
Lake Ann · 5 mi away

Fishing in Michigan needs a state license: Michigan fishing license guide · all Michigan venues